Examine source code of just, kuroo.

{
  "name": "just, kuroo.",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "yess.png"
    },
    "colors": {
      "frame": "rgba(227, 229, 232, 1)",
      "tab_background_text": "rgba(31, 31, 31, 0.58)",
      "toolbar": "rgba(255, 255, 255, 0.67)",
      "bookmark_text": "rgba(56, 55, 55, 0.57)",
      "toolbar_field": "rgba(247, 247, 247, 0.29)",
      "toolbar_field_text": "rgba(143, 143, 143, 0.51)"
    }
  }
}